A speaker vibrates a 150Hz what is it’s period

The electron configuration for chromium is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 5 4 s 1 instead of 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 4 4 s 1 . the configuration is an exception to the

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?